What is the product of the two factors (x4/3)(x2/3)

Hi, can anyone show me how to do this problem? 100 points for this. in advance

The figure shows triangle def and line segment bc, which is parallel to ef: triangle def has a point b on side de and point c on side df. the line bc is parallel to the line ef. part a: is triangle def similar to triangle dbc? explain using what you know about triangle similarity. part b: which line segment on triangle dbc corresponds to line segment ef? explain your answer. part c: which angle on triangle dbc corresponds to angle f? explain your answer. asap

Eric drove 275 miles in 5 hours. at the same rate how long would it take him to drive 495 miles?